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Questions tagged [pseudorepliction]

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Which error bars to use when comparing only two subjects when many replicates?

I want to plot discrete time measurements made for two subjects, but where many cells were observed for each subject in triplicate. I think the experimental unit is the subject, so I should just get a ...
maglorismyspiritanimal's user avatar
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Is there a best approach for statistical power for field experiment?

I'm setting up a field experiment and want to make a solid plan for the analysis, since that's whereI get stressed in the process. I will deploy 26 pairs of traps. 13 pairs will be in urban forest, ...
E10's user avatar
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What counts as pseudo-replication?

I'm interested in adding a new factor to my data set (to model against my response), but I need help thinking through if doing so would introduce pseudo-replication, or other problems as well. The way ...
Nate's user avatar
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3 votes
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How to handle Pseudoreplication - Aggregate observations per group for linear mixed model or take individual observations

I´m trying to fit a linear mixed model to test if my dependent variable (B) is different between my treatments (A with 2 levels A&B). The study was conducted at severals sampling sites. To account ...
Julia's user avatar
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I want to fit a linear regression model, but I know that if I treat each instance as unique there will be many pseudo replicates

I want to fit a linear regression model, but I know that if I treat each instance as unique there will be many pseudo replicates. I want to explore the relationship between 2 binary variables and one ...
taz's user avatar
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How to tell if I'm pseudoreplicating in a mixed model by taking slices of the same measurement

Here is my data setup. The dependent variable is mean resultant length (MRL), i.e., in context, the degree to which a firing unit is firing in phase with a particular frequency of the local field ...
Katie's user avatar
  • 273
1 vote
0 answers

Analysing a dataset that has mainly independent records but now has a few paired records

I am at the start of a project that collects data from subjects every 3 months. The data I currently have is nearly all independent (one record per subject, see screengrab below) but we've just hit ...
David Murphy's user avatar
3 votes
2 answers

Does this design indeed raise concerns about pseudoreplication?

We want to test the effect of dietary supplement on two groups of cows (randomized and controlled for starting weight and age). Group 1 (6 cattle) receives supplement 1 and group 2 (6 cattle) receives ...
Cobactan's user avatar
  • 131
1 vote
2 answers

meaning of independent samples

I am getting confused about the concept of independent samples, which is related to the concept of pseudoreplications. This question is related to this topic. But reading it does not make it clear for ...
quibble's user avatar
  • 1,694
1 vote
1 answer

How do I count replicates in chapter 1 of Crawley's book?

I am reading the second edition of Crawley's Statistics: An Introduction Using R and in the Pseudoreplication section of chapter 1 (pg. 15), he provides the following experiment structure: "...
Omortis's user avatar
  • 113
1 vote
0 answers

Does this experimental design avoid pseudo-replication?

I’m looking at a data set where 15 properties undertaking new management practices are sampled over three seasons. Measurements taken include variables such as vegetation cover and canopy cover. ...
Shelly Graham's user avatar
2 votes
0 answers

Questions regarding pseudoreplication and required random effects

My problem I would like to infer the relative importance of "habitat connectivity" compared to "habitat quality" to explain tits breeding success in a urban area (more details ...
Fanfoué's user avatar
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1 vote
3 answers

Which statistical test should be used to compare two groups with biological and technical replicates?

I'am conducting a drug screening experiment samples grouped by two conditions (expression or not of a specific molecular receptor). For the group expressing the receptor I have four diferent samples, ...
Ioanidis's user avatar
2 votes
1 answer

Are these data pseudoreplicated?

I have an amalgamation of independently collected datasets covering a large area of ocean where surveys to count birds have occurred sporadically over a long time. Some surveys were from boat, some ...
Wu Wei's user avatar
  • 154
1 vote
0 answers

Include variance in regression on mean values

I have a data set on a biological variable in a wild population. I am interested in how that variable changes with respect to an environmental variable, temperature. Given the constraints of sampling, ...
C. Denney's user avatar
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1 vote
2 answers

How does pseudoreplication differ from resampling

I wonder how pseudoreplication ( differs from resampling (which is simply resampling with replacement from a given sample). On the one hand, resampling ...
Ggjj11's user avatar
  • 1,543
1 vote
0 answers

Is it possible to affirm there is pseudoreplication in a design without making assumption on variable importance?

this is quite an abstract question, but I am trying to learn more of the basics in pseudoreplication. Pseudo replication is defined by Hurlbert (1984) as: Pseudoreplication may be defined , in ...
JMenezes's user avatar
  • 539
2 votes
1 answer

incorporating biological replicates in one-way ANOVA

I'm measuring a particular property of worms (e.g. length, speed, ...). The worms are subdivided in 3 treatments (genetic strains) and each treatment group consists of 15 individuals. I replicated the ...
ulrichtsblr's user avatar
4 votes
2 answers

How do I analyze a three factor ANOVA without replication in R?

This summer, I conducted a growth chamber experiment testing the effects of the projected climate change conditions on the growth and survival of newly germinated seedlings of Acadian forest tree ...
Rob's user avatar
  • 41
3 votes
2 answers

Split plot design with psudo replicates

I am working on a project and need to analyze data that I know is an example of a split plot design but I am having trouble setting the model up correctly. Here's the situation: A bakery is testing ...
Megan Lantz's user avatar
3 votes
0 answers

Pseudoreplication in a split-split plot design on count data in R

Agricultural Experimental design: a split-split plot in which a field is divided into 3 replications; each replication is divided into 2 to apply different pesticide spraying programs and each spray-...
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